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252a4bb8d2
Add the OpenTelemetry telemetry library and supporting infrastructure: Build system: - Conan opentelemetry-cpp dependency with OTLP/gRPC exporter - CMake integration for xrpl_telemetry library target - Levelization ordering updates Core library (libxrpl): - Telemetry class: provider lifecycle, span creation, sampling config - SpanGuard: RAII span management with attribute/exception helpers - TelemetryConfig: parse [telemetry] config section - NullTelemetry: no-op implementation when telemetry is disabled Application integration: - Telemetry member in ApplicationImp with start/stop lifecycle - getTelemetry() interface on Application - ServiceRegistry telemetry accessor Docker observability stack: - OTel Collector, Jaeger, Grafana docker-compose setup - Collector config with OTLP gRPC receiver and Jaeger exporter Config and docs: - Example telemetry config section in xrpld-example.cfg - Build documentation for telemetry setup Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>